On Fri, 2018-06-01 at 15:20 +0200, Peter Zijlstra wrote: > On Fri, Jun 01, 2018 at 02:57:53PM +0200, Mike Galbraith wrote: > > b956575bed91ecfb136a8300742ecbbf451471ab is the first bad commit > > commit b956575bed91ecfb136a8300742ecbbf451471ab > > Author: Andy Lutomirski <l...@kernel.org> > > Date: Mon Oct 9 09:50:49 2017 -0700 > > > > x86/mm: Flush more aggressively in lazy TLB mode > > Oh boy... Maybe we should start looking at that optimization Andy > mentioned. > > IIRC all page freeing does indeed go through tlb_remove_page(), it > shouldn't be too hard to make that work.
Page freeing does. However, page table freeing does not, and might need to be done in a different way. I wonder how expensive/effective it would be to free page tables with RCU, and have the RCU code flush the TLB if it notices the ctx_id is wrong? Also, I need to go find Andy's optimization, and see how it works :) -- All Rights Reversed.
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